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对尺寸相同而热处理状态不同的40Cr钢试样进行了磁声发射振铃计数率(N)的研究。发现回火态试样N值大小及其变化与原始马氏体形态有关。讨论了组织形态变化对磁声发射效应影响的机理。 相似文献
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采用声发射、磁记忆检测技术与常规无损检测技术相结合的方法对400m^3氧气球罐进行在线检验,得到了400m^3氧气球罐典型案例的检测方案和检测数据。结果表明,采用声发射、磁记忆检测、联合超声和磁粉检测可以实现氧气罐的在线检测,磁记忆榆测技术可以检测到内部非超标缺陷影响形成的应力集中,声发射技术评价缺陷的活性,常规超声检测可能存在表面缺陷漏检的情况,声发射、磁记忆检测弥补了常规无损检测方法的不足。容器加压声发射检测中不活动缺陷和活动缺陷的磁记忆信号有明显差异。 相似文献
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对尺寸相同而热处理状态不同的40Cr钢试样进行了磁声发射振铃计数率(N)的研究。发现回火态试样N值大小及其变化与原始马氏体形态有关。讨论了组织形态变化对磁声发射效应影响的机理。 相似文献
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用声发射对某液体推进剂贮罐出现的焊缝应力腐蚀进行了研究.结果表明,声发射技术可以用来对压力容器的应力腐蚀过程进行监控;根据声发射信号强度及其变化可以准确判断设备的运行状况,定量确定压力容器的服役年限. 相似文献
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WANG Zhengfu KE Wei Institute of Corrosion Protection of Metals Academia Sinica Shenyang ChinaZHU Zuming Insitute of Metal Research.Academia Sinica Shenyang China WANG Zhengfu Institute of Corrosion Protection of Metals Academia Sinica Shenyang China 《金属学报(英文版)》1990,3(10):241-245
Acoustic emisssion(AE)behavior during fatigue in either airer or 3.5% NaCl solution hasbeen studied for a structural steel(SM5OB-Zc)as quenched and normalized states.The ex-perimental results show that AE activity is strongly affected by the heat treatment and thecondition of environment.Some material constants about A E related with fatigue behaviorwere obtained and the AE sources in corrosion fatigue were discussed. 相似文献
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针对普通声发射(AE)检测仪缺乏源定位功能,开发了计算机辅助AE源检测定位系统,并详细论述了该系统的组成、接口、源定位算法和程序、剔除噪声等问题 相似文献
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ZHOU Zhao JI Shichen HU Zhuangqi SHI Changxu 《金属学报(英文版)》1989,2(2):137-142
Study of the solidification process of both Al-Si and Al-Cu alloys proved the presence ofacoustic emission phenomena.Two peaks of count rate have been observed.The total countsof both peaks increase with the increasing hydrogen content of the alloy.The mechanism ofproducing the acoustic emission has been discussed.At the same time,results obtained by oth-er techniques strongly support the good correlation between the acoustic emission andhydrogen releasing during solidification.The bubble nucleation between dendrite arms is themain cause of the first peak,while the fracture of the bridge connecting the interdendrites atthe later stage of solidification is the main cause of the second peak.It is probably due to thehydrogen evolution and accumulation to create high pressure in the interdendritie region. 相似文献
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MAGNETICACOUSTICEMISSIONCHARACTERISTICSOFHYDROGENATTACKEDLOWCARBONSTEEL¥LIHiaogang;MENGQinghai;CHENHua;CHENJinwei;YAOZhiming;... 相似文献